YOU SAID:

I jumped on the trampoline and then fell off.

INTO JAPANESE

トランポリンでジャンプし、その後、落ちた。

BACK INTO ENGLISH

I jumped on a trampoline and then fell.

INTO JAPANESE

私はトランポリンに飛び乗ってから転んだ。

BACK INTO ENGLISH

I jumped on the trampoline and fell down.

INTO JAPANESE

私はトランポリンに飛び乗って倒れました。

BACK INTO ENGLISH

I jumped on the trampoline and fell down.